Grade 7 – Review for Electricity and Magnetism – ANSWER KEY

1. A(n) CIRCUIT is a closed path that an electric current can follow.
2. In a(n) CONDUCTOR, electric charges can move easily.
3. A_PARALLEL_ circuit has more that one path for electric current to follow.
4. An object that does not contain equal amounts of positive charge and negative charge has a(n) _STATIC CHARGE
5. A(n) CURRENTis the flow of electric charges.
6. _VOLTAGE_ is a measure of the energy electrons transfer to a circuit as they flow.
7. A(n) ELECTROMAGNET is made of a current-carrying wire wrapped around an iron core.
8. A measure of how difficult it is for current to flow in an object is its _RESISTANCE_
9. What type of energy conversion occurs inside a battery? _CHEMICAL energy to _ELECTRICAL energy
10. Every electric charge is surrounded by an ELECTRIC FIELD_
11. In a permanent magnet, the domains are _LINED UP_
12. Increasing the voltage in a circuit increases the _ENERGY TRANSFERRED_ in a circuit?
13. The magnetic force between two magnets will repel if the poles are ALIKE_ and attract if the poles are DIFFERENT_
14. After electrons are transferred from glass to silk, which of the following is true about the glass and silk?
THEY ATTRACT EACH OTHER.
15. Which type of material makes a good electrical conductor? METALS LIKE COPPER, SILVER, ETC.
16.Bringing your negatively-charged hand near a doorknob charges the doorknob by INDUCTION_
17. If an object is positively charged, then it has more PROTONS than ELECTRONS.
18. What energy conversion takes place in a generator? MECHANICAL to ELECTRICAL_
19. What type of atomic particle does not have an electric charge? NEUTRON_
20. An object is electrically charged if the amounts of positive and negative charge it contains are not _EQUAL_.
21. _INSULATORS are materials in which electric charges do not move easily.
22. Lightning occurs when the STATIC CHARGE on a storm cloud causes charging by induction on the ground or another cloud.
23. A spark between your hand and the doorknob is an example of an ELECTRIC DISCHARGE
24. What causes current to flow in a wire? ELECTRIC CIRCUIT
25. Which of the following energy conversions occurs inside a battery?CHEMICAL TO ELECTRICAL
26. The measure of how difficult it is for electrons to flow in an object is called the ELECTRIC RESISTANCE
27. Increasing the voltage in a circuit increases the _IT INCREASES THE ELECTRIC CURRENT.
28. A(n) SERIES CIRCUIT circuit has only one path for current to follow.
29. A(n) ELECTROMAGNET_ is made of a current-carrying wire wrapped around an iron core.
30. A group of atoms that have their magnetic poles pointing in the same direction is called a(n) _MAGNETIC DOMAIN_.
31. Which of these does a simple generator rotate to produce current?A WIRE LOOP
32. Electrical current is measured in AMPERES.
33. Electrons have a NEGATIVE_ charge?
34. Voltage measures THE ENERGY ELECTRONS HAVE_.
35. Feeling a shock from a metal door handle is an example of an _ELECTRICAL DISCHARGE.
36. A __PARALLEL_ circuit has multiple paths for current flow.
37. Ohm's law states that _VOLTAGE_, CURRENT , AND RESISTANCE are related
38. What flows in an electric circuit? ELECTRONS
39. How do insulators and conductors differ?
INSULATORS DO NOT ALLOW ELECTRONS TO PASS THROUGH THEM EASILY AND CONDUCTORS LET THEM MORE EASILY.
40. As voltage increases, what happens to current?
IT INCREASES.